Ag-Au alloy nanoparticles: Synthesis and in situ monitoring SERS of plasmonic catalysis

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• 作者：Qingyan HanAuthor Vitae ; Chengyun ZhangAuthor Vitae ; Wei GaoAuthor Vitae ; Zhihang HanAuthor Vitae ; Tingzhuo LiuAuthor Vitae ; Caixia LiAuthor Vitae ; Zhaojin WangAuthor Vitae ; Enjie HeAuthor Vitae ; Hairong Zheng ; ^{hrzheng@snnu.edu.cn" class="auth_mail" title="E-mail the corresponding author}Author Vitae
• 关键词：Au-Ag alloy nanoparticles ; Surface plasmon resonance ; Surface-enhanced Raman scattering ; Plasmonic catalysis
• 刊名：Sensors & Actuators: B. Chemical
• 出版年：2016
• 出版时间：August 2016
• 年：2016
• 卷：231
• 期：Complete
• 页码：609-614
• 全文大小：1304 K

文摘

Noble metal nanostructures are currently of great interest for their unique plasmonic property and potential applications in catalysis and surface-enhanced spectroscopy. However, the application of plasmonic nanostructures for quantitatively in situ SERS monitoring of the catalytic reaction has been a great challenge for investigators because combining plasmonics with catalysis requires the same kind of noble metal nanoparticles (NPs) in two very different size regimes. Herein, We have demonstrated a facile wet chemical method to synthesize Au-Ag alloy plasmonic NPs that could combine the desired plasmonic and catalytic properties with same NPs. The catalytic activity of Au-Ag alloy NPs using the reduction of 4-nitrothiophenol (4-NTP) by sodium borohydride (NaBH₄) is chosen as a model reaction. The signals of the reaction processes are detected and identified through in situ SERS spectroscopy with high sensitivity. The insights gained by current study may serve as a promising and powerful technique for better investigation in the heterogeneous catalysis. Moreover, the reduction of aromatic nitro compounds with prepared Au-Ag alloy NPs also provides potential application in sewage treatment.